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A ball rolls off the top of a staircase ...

A ball rolls off the top of a staircase with a horizontal velocity `u ms^-1`. If the steps are `h` metre high and `b` metre wide, the ball will hit the edge of the `nth` step, if.

A

9

B

10

C

11

D

12

Text Solution

Verified by Experts

The correct Answer is:
A
a. `0.2n = 1/2 "gt"^2` or `t = sqrt((2 xx 0.2n)/(g))`
` 0.3 n = ut = 4.5 sqrt((2xx0.2n)/(g))`
` rArr n = 9`
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